Unresolved query

Very disappointing level of service received, took a mtn contract online and was sold a wrong deal which does not fit my needs. I was unable to connect until I spoke to a male representative who was kind enough to advise me to cancel the contract because it's never going to work for me. And I did almost two months ago, up until this day I have not received proper assistance with regards to this cancellation because I was charged for the service I did not receive. I spend hours on the phone while at work trying to sort out this query but no one seems to know on how to deal with this matter. Every time I go through to a new consultant, I have to repeat my story. They are not making notes. I even received a reference number to say it's being cancelled, however I still get charged. To make matters worse, they have charged me for June and July for this contract which is meant to be cancelled. I have had such a bad experience, they don't even deserve a single star.